Re: A metameric match between display and print?
Re: A metameric match between display and print?
- Subject: Re: A metameric match between display and print?
- From: Graeme Gill <email@hidden>
- Date: Thu, 13 May 2010 12:55:39 +1000
Marco Ugolini wrote:
Though I don't want to jump to possibly incorrect or hasty conclusions, I am
questioning the very usefulness and need for this type of displays. I'm not saying they
are useless, because I don't know enough to say so, but I'd like to be told clearly and
precisely why and in which ways they represent a technological advance.
In principle a CMY based filter display technology could be quite useful. As the
IEEE article points out, there are no perfect portable device displays at the
moment. LCD is very power inefficient (because each pixel filters 2/3 of
the light out and has polarisation losses), and is poor in bright sunlight
because it depends on the backlight.
Digital ink displays are slow, not terribly reflective and do color
poorly. Ideally a display would be flexible.
A CMY filter based display could have reasonable color, low power (because
its best case transmissive/reflectiveness is 100%), and could operate
well in sunlight in reflective mode,just like print or photographic
transparencies. Note though that it can suffer from the same gamut limitations
as print if it is used in reflective mode or with a backlight that is
broadband rather than RGB narrow band. But a practical electronic CMY filter
display is up against some problems. By it's nature it has to layer the
active elements one on top of each other, and this tends to create multiple
optical surfaces. If each filter is not 100% transparent in the "off" state,
then the lack of transmittance is compounded with 3 layers. The choice of
CMY colorants have similar issues to print in terms of how well they complement
each other (black point and black density) vs. how saturated colors can be
with broadband incident or reflected lights source. And then there are the
electronic issues such as speed of operation (can it do animation ?),
contrast ratio, proportionality (does it do grey levels well ?), power
consumption of the filters, addressing/driving issues, manufacturing
costs, etc.
Graeme Gill.
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